Boise Weather in August
August in Boise brings very high temperatures, with highs of 32°C (90°F) and nights dropping to 14°C (57°F). It's also the driest month of the year, ideal for those who want to avoid rain.
Rainfall in Boise in August
The risk of rain is at its lowest this month, making it a reliable choice for outdoor plans. Looking at the last 30 years, the data shows about 4 days with rain, averaging 8.3 mm (0.3 in) for the month. The occasional light shower is possible, but rain is rarely an issue this month.
Temperature in Boise in August
Boise in August has perfect weather. Days reach 32°C (90°F) and nights cool to 14°C (57°F). Mornings and evenings are often more comfortable than the peak afternoon hours. With lows of 14°C (57°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Boise in August
There are approximately 358 hours of sunshine this month, resulting in mostly clear days.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, September and October typically offer the best weather for Boise.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Boise Temperature in August
Min Temperature
14°C (57°F)
Max Temperature
32°C (90°F)
Chance of Rain
12%
Precipitation
8.3 mm (0.3 in)
Rainy days
4 days
Humidity
37%
Sunshine
358 hours
Percentage Sunshine
83%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Boise typically drop from around 34°C (93°F) at the start of August to approximately 30°C (86°F) by the end. Nights are pleasant, with lows typically ranging from 14°C (57°F) to 18°C (64°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Boise in August
Browse day-by-day weather records for Boise spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Boise historical weather extremes in August
The extremes listed below come from historical weather data collected in Boise from 1976 through 2025.
- On August 10, 2018, temperatures climbed to 42°C (108°F), marking the warmest August day on record.
- Nighttime temperatures dropped to 1°C (34°F) on August 25, 1992, marking the coldest August night on record.
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Boise in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. With minimal rainfall expected, you can leave the rain gear at home. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Boise in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Temperature Rainfall Sunshine Humidity
See the full Boise climate overview or explore weather in the United States of America.
